Re-biasing a CJ Premier 8

I would concurr with avguygeorge on the influence of the input and driver tubes. That said: Both the 6fq7's and the 5751's in the amplifiers should give you at least 3000 hours of life before replacement [unless they go noisey or microphonic]. The nos triple mica sylvania 5751's as well as the rca triple mica black plates can have a profound impact on the resolution and bass drive in the CJ amplifiers.

I was placing more focus to the output tubes, thanks for the info.

Fernando

Do you still own these amps? I am breaking in these amps which I just purchased with new tubes from CJ. I am not very happy yet with the sound as they need to break in! What pre amp and speakers have you chosen with these monos?

When I had my 8's, I used a CAT-3--(10 tubes in that). Just before tuning my estate to my local DWP--- or my tube supplier---I sold the big-8's.--Now use CJ's 350 ss amp and may not have to go under. (I listened way more than some !!)
---Which made it costly.-- I could use up 3000 hrs in a week, and I never exaggerate.

I sold the amp a few years back - I partnered it with many preamos - the best option was a CJ Premier 11 - a little dark sounding - best sound came out from 16 expensive KT88 I got from the UK - (cant remember the make) but are quite famous.

Worked great with my previous Avalon Eclipse speakers.

Hope this helps